[MacPorts] #60588: urbit: Undefined symbols _dprintf

[MacPorts]

#60588: urbit: Undefined symbols _dprintf
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  l2dy
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  urbit
------------------------+----------------------
 [https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/27753/steps
 /install-port/logs/stdio urbit fails to build on 10.6] because:

 {{{
 Undefined symbols for architecture x86_64:
   "_dprintf", referenced from:
       __http_serv_start_all in vere_http.c.o
 ld: symbol(s) not found for architecture x86_64
 }}}

 I'm not sure how to fix this. I don't know what `dprintf` is and I
 couldn't find it in legacysupport.

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Ticket URL: <https://trac.macports.org/ticket/60588>
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